@isTest
private class ReturnOrderListPDFControllerTest {
    static testMethod void testMethod1() {
              //新建客户
        Account acc = TestUtils.createAccount();
        insert acc;
        //新建退货通知单
        ReturnOrder__c rr = new ReturnOrder__c(
        	Account__c = acc.Id
        );
        insert rr;
        //新建退货通知单明细
        ReturnOrderList__c rrl = new ReturnOrderList__c(
            ReturnOrderList__c = rr.Id,
            RefundNumber__c = 1,
            Account__c = acc.Id
        ); 
        insert rrl;
        PageReference page = new PageReference('/apex/ReturnOrderListPDF?id=' + rr.Id);
        System.Test.setCurrentPage(page);
        ReturnOrderListPDFController apc=new ReturnOrderListPDFController();
        
    }
}